Ignition-arch.



Patented Ian. 7, I902.

No. 690,473. I

J. P. SNEDDON. mmnou ARCH.

(A licafioi flied on. 10, 1901.)

(No Model.)

UNITED STATES PATENT ()FF'ICET,

JAMES P. SNEDDON, OF BARBERTON, OHIO, ASSIGNOR TO THE STERLING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

IGNITION-ARCH.

SPECIFICATION forming part of Letters Patent No. 690,473, dated January '7, 1902.

Application filed October 10,1901. Seris1No.78,1Bl. (No model.)

To coZZ whmn it may concern.-

Be it known that 1, JAMES P. SNEDDON, a resident of Barberton, in the county of Summit and State of Ohio, have invented a new and useful Improvement in Ignition-Arches and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to fire-arches for boilerfurnaces and the like, and more especially to ignition-arches.

Fire-arches are usually built of brickwork and in the form ofan arch-that is, higher at their middle portion than at their ends. ,By reason of the intense heat to which they are subjected it is diflicult to so construct them that they will remain in place for any length of time. This is due largely to the limited height between the surface of the grate and the bottom of the boiler, which prevents giving the arch such a rise at its center as to insure stability under the intense heat to which it is subjected. The use of a flat arch of brickwork is impossible, owing to the inability to hold it up. It hasbeen proposed to form flat arches by the use of girders covered with firebricks or tiles; but difficulty is experienced in providing a girder which is simple and cheap of construction and to which the firebrick or tile can be so attached as to insure their remaining in place.

It is the object of my invention to provide a fire-arch, and more especiallyan ignitionarch, which is flat or straight across the furnace and which is simple in construction and stable in use.

To this end it comprises, generally stated, a girder or beam extending transversely of the furnace and provided with an inwardlyprojecting flange, together with tiles or firebrick of special form adapted to be supported thereby and to entirely protect the same from the heat.

In the accompanying drawings, Figure 1 is rear view of the girder or beam in place in the furnace. Fig. 2 is a cross-section of an ignition-arch applied to a furnace having a stoker-grate. Fig. 3 is a similar view of an ignition-arch applied to a hand-fed furnace; and Fig.4 is a similar view,on a reduced scale, of the rear arch of a furnace provided with a Stoker-grate.

In the drawings, 1 1 represent the side walls of the boiler-furnace; 2,the water-tubes; 3, the headers therefor, and 4 the grate, this grate in Figs. 2 and 4 being of the chainstoker type and in Fig. 3 of the usual bar type. All ofthese parts, however, form no part of my invention and may be of any preferred construction and in place of the watertube boiler shown any other typeof boiler may be employed.

The ignition-arch is shown at 5, Figs. 2 and 3, and the girder therefor is shown at 6. This girder may be'of any approved type, providing it has a broad inwardly-projecting flange 7; but I prefer to form it as a box-girder, which provides the hollow air-space 8, communicating at each end with the atmosphere or an air-supply-duct, thereby keeping the same 0001. As a convenient means for constructing such a girder it may be built up of the channel-beams 9 10, top plate 11, and bottom plate 12, the last-named plate projecting inwardly to form the flange 7, as shown. The top and bottom plates may be secured to the channel-beams 9 and 10 in any preferred or convenient way, such as by riveting, and in order to strengthen the girder the top plate 11 and bottom plate 12 are tied together at intervals by the gusset-braces 13, which have their edges flanged and riveted or otherwise secured to the plates 11 and 12 and beam 10. This girder has its ends supported on the side walls of the furnace, the latter bein g pref rably provided with a plate, such as the angl 14, for receiving the ends of the transverse girder. Secured to the front of this girder is the front plate 15, which on its rear face is provided with a suitable ledge 16, the latter being preferably formed by an angle-bar, as shown. On this face-plate is also preferably mounted the gate 17 for closing the feedingopening 18.

I protect the girder 6 by means of suitablyshaped tiles or fire-bricks. The lower face of said girder is protected by the tiles 19, the outer ends of which are supported bythe ledge '16 and the inner ends of which interlock with specially-formed tiles 20. The latter are adapted to rest on the ledge or flange 7 of the girder and project beyond the same and have a downwardly-projecting portion which is formed to interlock with the inner ends of the tiles or bricks 19. Asa convenient means for interlocking these tiles the tile 19 is provided with the projection 21, which is supported upon the projecting portion 22 of the tile 20. The tiles or bricks 19 are therefore supported at their forward ends by the ledge 16 and at their rear ends by the underhanging portions 22 of the tiles 20, and the latter are supported upon the ledge 7 of the girder. The tiles or bricks 20 are provided with the inwardly-exten din g portion 23, which may be projected to any desired distance and which serve to divert the course of the flame and heat and prevent the same from going too directly across the water-tubes 2. Above the tiles 20 are placed the tiles or fire-bricks 24, the latter extending up as high as the girder and serving to protect the remainder of said girder from the heat. These latter tiles or bricks are preferably formed with the openings 25, which register with similar openings 26 in the channel-beam 10 and which serve to admit cold air to the furnace-chamber above the fire in order to assist combustion. The openings 26 are provided with means, such as the covers 27, whereby the openings may be controlled to regulate the admission of air to the fire.

In Fig. 3 the construction is substantially the same as shown in Fig. 2, the only difference being that the tiles or bricks 19 are not quite so thick, this being made necessary because the opening 18 in hand-fed furnaces must be higher than in stokcr-fed furnaces. In Fig. 2 the tiles 19 are provided with grooves for reciving the ledge 16, but in Fig. 3 said tiles rest upon said ledge 16.

The construction of the rear arch for stokerfed furnaces shown in Fig. 4: is substantially the same as that shown in Fig. 2 for the ignition-arch, the only difference being that only a single channel-beam 10 is used, the channel-beam 9 being displaced by the outer casing 29. The'tiles 20 also are formed much shorter and have not the projecting ends 23 extending into the furnace-chamber.

It will be understood that the specific shape of tiles and fire-bricks is not necessary. For instance, the tiles 24. may be made in several pieces, if desired, or, if desired, they may be made integral with the tiles 20. It will also be understood that different forms of transverse girders may be employed, it being only essential that the same be provided with a rather-extended inwardly-projecting ledge 7. The girder shown and described is simple and cheap to make,and the tiles or fire-bricks are also of comparatively simple form and are so shaped that they can be readily applied to the girder and completely protect the latter from the intense heat of the furnace and at the same time cannot fall off or become displaced.

WVhat I claim as my invention, and desire to secure by Letters Patent, is

1. A fire-arch for furnaces comprising a transverse girder having an inwardly-projecting flange or ledge, tiles or fire-brick adapted to cover the lower face of said girder, and tiles or fire brick adapted to rest on the inwardly-projecting flange of the girder and having downwardly-projecting portions adapted to engage with the tiles coveringthe lower face of the girder and hold the same in place.

2. A fire-arch for furnaces comprising a transverse girder or beam having an inwardlyprojecting flange, tiles or fire-brick adapted to cover the lower face of said girder, a ledge for supporting the outer ends of said tiles or brick, and tiles or fire-brick adapted to rest on the inwardly-proj ecting flange of the girder and having downwardly-projecting portions adapted to engage with the inner ends of the tiles covering the lower face of the girder and hold the same in place.

3. A fire-arch for furnaces comprising a transverse girder or beam having an inwardlyprojecting flange, tiles or fire-brick adapted to cover the lower face .of said girder, tiles or fire-brick adapted to rest on the inwardlyprojecting flange of the girder and having downwardly-projecting portions adapted to engage with the tiles covering the lower face of the girder to hold the same in place, and other tiles above the main tiles to protect the inner face of the girder.

,4. A fire-arch for furnaces comprising a transverse girder comprising a flanged shape and a plate secured to the lower flange thereof and projecting inwardly to form a ledge,

. tiles or fire-brick adapted to cover the lower face of said girder, and tiles or fire-brick adapted to rest on the inwardly-projecting ledge and having downwardly-projecting portions adapted to interlock with the tiles covering the lower face of the girder to hold the same in place.

5. A fire-arch for furnaces comprising a transverse girder formed of a channel shape,

plates secured to the upper and lower faces thereof, the lower plate projecting inwardly to form a ledge, gusset-braces connecting said upper and lower plates, fire-brick or tiles adapted to cover the lower face of said girder, and tiles or fire-brick adapted to rest on the inwardly-projecting ledge and having downwardly-projecting portions adapted to interlock with the tiles covering the lower face of the girder to hold the same in place.

6. A fire-arch for furnaces comprising a hollow box-girder having its ends open and having an inwardly-projecting flange or ledge, tiles or fire-brick adapted to cover the lower face of said girder and tiles or fire-brick adapted, to rest on the inwardly-projecting flange and having downwardly-projecting portions adapted to interlock with the tiles covering the lower face of the girder to hold the same in place.

7. A fire-arch for furnaces comprising a hollow box-girder having open ends and hav-- ing an inwardly-projecting flange, tiles or fire-brick adapted to cover the lower face of said girder, tiles or fire-brick adapted to rest on the inwardly-projecting flange and having downwardly-projecting portions adapted to interlock with the tiles covering the lower face of the girder to hold the same in place, and tiles or fire-brick above the main tiles, said last-named tiles protecting the inner face of the girder and being provided with openings registering with openings in the hollow box-girder.

8. A fire-arch for furnaces comprising a transverse girder or beam having an inwardly-projecting flange, tiles or fire-brick adapted to cover the lower face of said girder,

JAMES P. SNEDDON.

Witnesses:

E. E. BAKER, J. CLARENCE FRANK. 

